Remove classes from example code.

examples/classes.janet

@@ -1,104 +0,0 @@
-#
-# A simple OO implementation similar to that of the Self language.
-# Objects are just tables in which the class is the prototype table.
-# This means that classes themselves are also objects.
-#
-# Create a new class
-#   (defclass Car)
-# or
-#   (def Car @{})
-#
-# Define a constructor
-#   (defm Car:init [color]
-#     (put self :color color))
-#
-# Define a method
-#   (defm Car:honk []
-#     (print "I am a " (get self :color) " car!"))
-#
-# Create an instance
-#   (def mycar (new Car :red))
-#
-# Call a method
-#   (mcall mycar:honk)
-# or
-#   ($ mycar:honk)
-# If the method declaration is in scope, one can also
-# invoke the method directly.
-#   (Car:honk mycar)
-
-(defn- parse-signature
-  "Turn a signature into a (method, object) pair."
-  [signature]
-  (when (not (symbol? signature)) (error "expected method signature"))
-  (def parts (string.split ":" signature))
-  (def self (symbol (get parts 0)))
-  (def method (apply symbol (tuple.slice parts 1)))
-  (tuple (tuple 'quote method) self))
-
-(defn- add-self-to-body
-  "Take a function definition and add the parameter 'self'
-  to the declaration."
-  [body]
-  (def args-index (find-index tuple? body))
-  (def bodya (apply array body))
-  (put bodya args-index (tuple.prepend (get bodya args-index) 'self))
-  bodya)
-
-#
-# Public API
-#
-
-(def class 
-  "(class obj)\n\nGets the class of an object."
-  table.getproto)
-
-(defn instance-of?
-  "Checks if an object is an instance of a class."
-  [class obj]
-  (if obj (or 
-            (= class obj) 
-            (instance-of? class (table.getproto obj)))))
-
-(defmacro mcall
-  "Call a method."
-  [signature & args]
-  (def [method self] (parse-signature signature))
-  (apply tuple (tuple get self method) self args))
-
-(def $ :macro mcall)
-
-(defmacro wrap-mcall
-  "Wrap a method call in a function."
-  [signature & args]
-  (def [method self] (parse-signature signature))
-  (def $m (gensym))
-  (def $args (gensym))
-  (tuple 'do
-         (tuple 'def $m (tuple get self method))
-         (tuple 'fn (symbol "wrapped-" signature) [tuple '& $args]
-                (tuple apply $m self $args))))
-
-(defn new
-  "Create a new instance of a class by creating a new
-  table whose prototype is class. If class has an init method,
-  that will be called on the new object. Returns the new object."
-  [class & args]
-  (def obj (table.setproto @{} class))
-  (def init (get class 'init))
-  (when init (apply init obj args))
-  obj)
-
-(defmacro defm
-  "Defines a method for a class."
-  [signature & args]
-  (def [method self] (parse-signature signature))
-  (def newargs (add-self-to-body args))
-  (tuple put self method (apply defn signature newargs)))
-
-(defmacro defclass
-  "Defines a new class."
-  [name & args]
-  (if (not name) (error "expected a name"))
-  (tuple 'def name
-         (apply tuple table :name (tuple 'quote name) args)))